gistfile1.rb

# app/controllers/users/registrations_controller.rb
class Users::RegistrationsController < Devise::RegistrationsController
  def create
    build_resource

    if resource.save
      if resource.respond_to?(:confirm!) && !resource.confirmed?
        confirmation_hash = Digest::SHA2.hexdigest(resource.password_salt + resource.confirmation_token)
        redirect_to awaiting_confirmation_path(resource, confirmation_hash)
      else
        set_flash_message :notice, :signed_up
        sign_in_and_redirect(resource_name, resource)
      end
    else
      clean_up_passwords(resource)
      render_with_scope :new
    end
  end
end

# app/controllers/users/confirmations_controller
class Users::ConfirmationsController < Devise::ConfirmationsController
  def awaiting
    confirmation_hash = params[:confirmation_hash]
    resource = User.find(params[:id])
    expected_confirmation_hash = Digest::SHA2.hexdigest(resource.password_salt + resource.confirmation_token)
    if confirmation_hash != expected_confirmation_hash
      redirect_to new_user_session_path
    else
      render :awaiting
    end
  end
end

# app/config/routes.rb
devise_for :users, :controllers => {
  :registrations => "users/registrations",
  :confirmations => "users/confirmations"
}

as :user do
  get "users/confirmation/awaiting/:id/:confirmation_hash" => "users/confirmations#awaiting", :as => "awaiting_confirmation"
end